18V/8A Step-Down Silent Switcher 3 with Ultralow Noise Reference

The LT8625SP/LT8625SP-1 synchronous step-down regulator features third-generation Silent Switcher technology which is uniquely designed to combine an ultralow noise reference with Silent Switcher architecture in order to achieve both high efficiency and excellent wideband noise performance.

The innovative ultralow noise architecture provides exceptional low frequency (0.1Hz to 100kHz) output noise performance in a switching regulator. The output voltage can be programmed with a single resistor, providing unity-gain operation over the output range, resulting in virtually constant output noise independent of output voltage.

Silent Switcher architecture minimizes EMI emissions while delivering high efficiency at high switching frequencies. The top of the package features exposed die for optional heat sink attachment which can be used to significantly improve thermal performance.

The LT8625SP/LT8625SP-1 is ideal for high current, noise sensitive applications which benefit from the high efficiency of a synchronous switching regulator.

Applications

* RF Power Suppliers: PLLs, VCOs, Mixers, LNAs, PAs

* High Speed/High Precision ADCs/DACs

* Low Noise Instrumentation

* Silent Switcher® 3 Architecture

* Ultralow RMS Noise (10Hz to 100kHz): 4μVRMS

* Ultralow Spot Noise: 4nV/√Hz at 10kHz

* Ultralow EMI Emissions on Any PCB

* Internal Bypass Capacitors Reduce Radiated EMI

* High Efficiency at High Frequency

* Ultrafast Transient Response: 1μs

* Fast Minimum Switch On-Time: 15ns

* Input Voltage Range: 2.7V to 18V

* Output Voltage Range: 0V to (PVIN − 0.5V)